Overlapping window frames

How can I keep one frame in front of another without having a larger frame beneath concealing the smaller one in front when activated? I don't want to use tiling since it cuts down my work space. I saw this guy do a demo, and I don't know how he got them to overlap.
![alt text]( image url)

For me the un-docked window stays over the docked window, even when working on the big docked window. Have you perhaps undocked both the big and the small window ? BTW I don't use a Mac ... so if you do that may be another differrence

I use the Navigator window for a thumbnail view of the image I'm working on, and the Sub View window for reference images. They work fairly well and both float over top, although yeah that's one thing I don't like about the MacOS version of CSP. I have the same issue in Photoshop for MacOS.